President Obama on Monday rebuked Donald TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE for his comments about the Muslim parents of a slain Army officer.

“No one, no one has given more for our freedom and our security than our Gold Star families,” Obama said during a speech to the Disabled American Veterans' annual convention in Atlanta. 

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Obama said that he personally requested that a mother whose son was killed in Afghanistan, Sharon Belkofer, introduce him at last week’s Democratic National Convention in Philadelphia because parents like her “have made a sacrifice that most of us cannot even begin to imagine.”

"They represent the very best of our country," he said. “And we have to do everything we can for those families, and honor them and be humbled by them.”

Obama did not mention Trump by name or specifically cite his comments about the parents of Capt. Humayun Khan. But he praised the veterans organization as “a group that understands sacrifice,” a slap at Trump. 

The president joins a growing list of officials in both parties who have condemned Trump for his comments about the Khan family, whose son was killed in 2004 during the Iraq War.

Four days ago, Khan’s father, Khizr, delivered a speech at the Democratic National Convention denouncing Trump’s call for a temporary ban on Muslim immigration to the U.S. 

Standing on stage beside his wife, Khan waved a pocket U.S. Constitution and asked Trump whether he’s ever read the founding document. He also said Trump has “sacrificed nothing and no one for this country.”

The business magnate responded in a Sunday interview with ABC News that he has “made a lot of sacrifices” to build his business empire. He also suggested that Khan’s mother, Ghazala, did not speak at the convention because of her faith. 

Ghazala Khan said that she stayed silent on stage because she was nervous and emotional, and said she finds it difficult to speak about her late son. 

“Walking onto the convention stage, with a huge picture of my son behind me, I could hardly control myself,” she wrote in a Washington Post op-ed.

“What mother could? Donald Trump has children whom he loves. Does he really need to wonder why I did not speak?”

Obama condemned a laundry list of the Republican nominee’s statements about the nation’s armed forces and national security policies. 

They include Trump’s claim that the military has turned into a “disaster” under the president’s watch and his threat to not defend Eastern European NATO allies countries against Russian aggression.

“As commander-in-chief, I’m pretty tired of some folks trash-talking America’s military and troops,” Obama said. 

Even though the military has downsized since major ground operations ended in Iraq and Afghanistan, the president said the U.S. still has “the most capable fighting force in history and we’re going to keep it that way.”

He also pledged the U.S. and its allies would defeat the Islamic State in Iraq and Syria and come to the defense of NATO partners, after Trump said he would make American military assistance conditional on their financial contributions to the alliance.

“In the face of Russian aggression, we’re not going to turn our back to our allies in Europe,” he said. “We’re going to stay united in NATO, which is the world’s strongest alliance.”

- Updated at 2:53 p.m.